Material Testing

Fraunhofer-Center HTL measures the composition, microstructure and properties of materials. On demand, the Fraunhofer-Center HTL develops application-specific characterization processes and gives customers advice on potential improvements to processes. The focus of testing at Fraunhofer-Center HTL lies in non-destructive as well as mechanical and thermal measuring methods.

 

 

Non-destructive Testing

 

The following methods are available for non-destructive testing:

  • Computer tomography (225 kV and 450 kV radiation source)
  • Water and air-coupled ultrasound measurement
  • Thermography (Lockin and thermal imaging)
  • Terahertz technology
  • Radioscopy

With the non-destructive testing nearly all monolithic materials (ceramics, plastics, metals) and composite materials can be analyzed. The Fraunhofer-Center HTL has extensive experience in testing and evaluating serial parts for industrial customers. In addition to non-destructive testing detailed structural studies of materials in the different stages of production can be carried out by e.g. examining polished sections by optical and electron microscopy.

 

Mechanical Test Methods

 

For mechanical testing all standard test methods are available. Samples are taken and prepared according to the respective standards, e.g. for the determination of:

  • Tensile and compressive properties (e.g. resistance and stiffness (as per DIN EN 658-1, DIN 15156)
  • Shear resistance (DIN EN ISO 14130, DIN EN 12289)
  • Three-point and four-point bending strength and stiffness (DIN EN 658-3, DIN EN 843-1)
  • Torsion properties (DIN 14869-1, ASTM D5279)
  • Notch impact resistance according to Charpy (DIN EN ISO 142-2)
  • Notch impact properties of metals (DIN EN 10045-1)
  • Scratch resistance of layers (DIN EN 1071-3) or
  • Hardness measurements according to Rockwell (DIN 51917) or Vickers (DIN EN 843.4).

Customized test assemblies are designed and used for the determination of mechanical component properties. The measuring results are compared with appropriate standards or validated by finite element modeling.

The thermal tests are standard processes or performed by special ThermoOptical Measuring systems (TOM) (see ThermoOptical Measuring devices).

For chemical stability and corrosion tests there are different methods available at the Fraunhofer-Center HTL. Chemical resistance tests can be carried out both in acidic and basic solutions as well as in different gases and gas mixtures. It is also possible to imitate different temperature and pressure conditions in the lab. The Fraunhofer-Center HTL performs salt spray tests according to DIN EN ISO 9227 and our chemical analysis enables us to examine and document corrosion damage and material changes. Corrosion tests can also be conducted with an in-situ weight measurement at high temperatures in various atmospheres. (see TOM_chem)

Through the collaboration with the Center for Applied Analysis (ZAA) at the Fraunhofer ISC Würzburg we have numerous other measurement methods available. This allows for a problem-oriented approach in which the optimal methods are used for every specific task.

Our Services:

  • Non-destructive testing of samples and components with dimensions smaller than 50 µm up to 700 mm in diameter and 2000 mm height
  • Dimensional and damage analysis
  • Volumetric structural analysis with a resolution of 2 µm using micro-computed tomography
  • Failure analysis and lifetime prediction by comparative computer tomography measurements of components before and after stress tests
  • In-situ analysis of thermal, mechanical or chemical stresses by computer tomography and thermography
  • Examination of small series and creation of failure catalogs
  • Microscopic analysis of polished sections by optical and electron microscopy
  • Chemical and elemental analysis
  • Density measurements
  • Mechanical testing of ceramic, metal and composite samples
  • 3-point and 4-point bending tests according to DIN EN
  • Pressure and tensile tests according to DIN EN
  • Vibration resistance test
  • Fracture resistance, fracture energy
  • Fiber bundle, fabrics and single fiber tensile tests according to DIN EN
  • Ball on ring test, double ring test
  • Determination of Weibull parameters and elastic moduli
  • Determination of interlaminar shear strength of layered composites (ILS)
  • Mechanical tests at temperatures ranging from room temperature to 1500 °C (flexural-, compressive-, tensile-, vibration strength)
  • Customer specific corrosion tests in acids and alkalis
  • Salt spray tests and long term studies according to DIN standard
  • Sample analysis of the effects of corrosion
  • Analysis of corrosion in hot gases and dusts up to 1500 °C
  • Interpretation of the resulting data in dialogue with the customer or project partner
  • Preparation of audit reports

Characterization

At Fraunhofer-Center HTL, we conduct mechanical and non-destructive material testings with modern testing facilities, and if required, we develop customer-specific measurement processes.

Fraunhofer-Center HTL measures the composition, microstructure and properties of materials.

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Non-Destructive Testing Methods